JP5876243B2 - Absorbent articles - Google Patents

Description

  The present invention has an absorbability as an anti-slipping adhesive pattern that fits different body shapes on the front side and the back side of the body, prevents misalignment and twisting in the worn state, and prevents flaps from turning over at the front and rear parts. It relates to goods.

  In recent years, in Patent Document 1 shown below, as shown in FIG. 14, an absorbent body 53 is interposed between a liquid-permeable top sheet 51 and a liquid-impervious back sheet 52, and the presence of the absorbent body 53 in the surroundings. In the absorbent article in which the flap portion F is not formed, the outer shape of the flap portion F at least in the front portion and the rear portion of the absorbent article 50 continuously changes the direction of the tangent to the outer shape line of the flap portion F. A wavy shape line 57 composed of a combination of the changed convex curves 54 and 55 and a concave curve 56, and a mountain-shaped inclined line 53a in which the width of the absorber 53 gradually decreases in these front and rear portions. The wavy shape line 57 is formed along the inclined line 53a, and the outer shape of the flap portion F has a relatively large curvature at the central tip portion of the absorbent article 50. The wave-like shape line portion 57 formed along the inclined line 53a on both sides is formed as a combination of a concave curve 56 and a convex curve 55 having a relatively small radius of curvature. An article 50 is disclosed. According to this absorbent article, by forming the product outer shape of the front and rear end parts into a shape combining unevenness, there is an effect that wrinkles and twists are less likely to occur in the flap part.

  On the other hand, the anti-slipping pressure-sensitive adhesive layer applied to the outer surface of the liquid-impermeable back sheet has a coating pattern that does not follow the outer shape of the product, and a plurality of anti-slipping pressure-sensitive adhesive layers along the longitudinal direction of the absorbent article For this reason, the wavy outline may be turned or bent at the convex curve portion.

  With respect to such a problem, in Patent Document 2 below, as shown in FIG. 15, the vertically long absorptivity attached to the underwear via the adhesive portions 62 a to 62 d provided on the non-skin contact surface of the back sheet 61. It is the article | item 60, Comprising: The said adhesion parts 62a-62d are each provided in the longitudinal direction front-and-back end part and the longitudinal direction both sides of the said absorbent article 60, and the said absorbent article from the center part of the said absorbent article 60 The band having a predetermined width extending toward both the front corner and the rear corner of the longitudinal direction of 60 and the central portion are non-adhesive portions 63 where the adhesive portions do not exist, and the outer edges of the adhesive portions 62a to 62d are An absorbent article that is within 10 mm from the outer edge of the absorbent article 60 and is present along the outer edge is disclosed. In the case of this absorbent article, the outer edges of the adhesive portions 62a to 62d are close to the outer edge of the absorbent article 60 and are formed along the outer edges, which can greatly contribute to prevention of turning-up.

Japanese Patent No. 4522444 JP 2010-115337 A

  However, in the case of the absorbent article according to Patent Document 1, the body of the wearer is not considered in spite of the fact that the front part and the rear part are largely different from each other at the body fluid discharge site. Since the wavy shape line of the part and the wavy shape line of the rear part were formed in substantially the same shape, there were problems such as insufficient fit and wearing feeling.

  In addition, in the case of the anti-displacement adhesive pattern according to Patent Document 2, since the most area of the back sheet is adhered to the shorts by the anti-displacement adhesive, the application of the absorbent article according to Patent Document 1 as it is. As a result, the absorbent article is restrained by the movement of the body and feels strange when worn.

Accordingly challenge of the present invention, the absorbent article outer shape of the flap portion in the front portion and the rear portion is a wavy shape lines which consist of a combination of convex curved portions and concave curved portions of at least said absorbent article, together along the body type of the front and rear with a different body in the body, as well as easy to fit to follow the movement of the body, can in alleviating the discomfort in the mounted state by to follow the movement of the body, the front portion and An object of the present invention is to provide an absorbent article having an anti-displacement pressure-sensitive adhesive layer pattern that can eliminate turning and folding at the flap portion of the rear portion.

In order to solve the above-mentioned problem, as the present invention according to claim 1, an absorbent body is interposed between the liquid-permeable top sheet and the liquid-impervious back sheet, and there is a flap portion in which no absorbent body exists around. The outer shape of the flap portion formed at least in the front portion and the rear portion of the absorbent article is a wavy shape line formed of a combination of a convex curve portion having a predetermined curvature radius and a concave curve portion having a predetermined curvature radius In absorbent articles
The wavy shape line has a central convex curve portion at the center in the width direction of the absorbent article, and a convex curve so that the direction of the tangent to the outline of the flap portion continuously changes positive and negative on both sides thereof And the concave curve portion are alternately arranged in a wavy curve, and the convex curve portion and the concave curve portion located on both sides of the central convex curve portion are the longitudinal center line of the absorbent article. Formed symmetrically on the border,
The central convex curve portion of the front portion is formed with a relatively large radius of curvature and arc length with respect to the central convex curve portion of the rear portion ,
A non-slip adhesive layer is formed on the non-skin contact surface of the main body portion where the absorbent body is interposed between the liquid-permeable surface sheet and the liquid-impermeable back sheet, for fixing to underwear, The anti-slipping adhesive layer is a plurality of strip-like anti-slipping adhesive layers formed along the longitudinal direction of the absorbent article at each of the positions in the width direction corresponding to the respective convex curved parts, and each The strip-like anti-slipping adhesive layer is close to the convex curve portion so that the longitudinal distance of the absorbent article between the front and rear end portions and the outline of the absorbent article is within 15 mm . Articles are provided.

In the first aspect of the present invention, the wavy shape line has a central convex curve portion at the center in the width direction of the absorbent article, and the direction of the tangent to the outline of the flap portion is continuously positive and negative on both sides thereof. The convex curve portion and the concave curve portion are alternately arranged so that the convex curve portion and the concave curve portion are alternately arranged, and the convex curve portion and the concave curve portion located on both sides of the central convex curve portion are It is formed in a bilaterally symmetrical arrangement with respect to the longitudinal center line of the absorbent article, and the central convex curve portion of the front side portion has a relatively large radius of curvature with respect to the central convex curve portion of the rear side portion. And an arc length.

  Accordingly, since the front side portion has a relatively large central convex curve portion, the contact with the pubic bone becomes soft, and the uncomfortable feeling that breaks toward the pubic side can be reduced. On the other hand, since the rear side portion has a relatively small central convex curve portion, it becomes easy to bite into the valley of the buttocks. As described above, in the case of the present absorbent article in which the wavy shape lines of the front and rear portions are changed in accordance with the body shape of the body, it follows the body shape of the body and easily follows the movement of the body. In addition, it is possible to reduce a sense of discomfort at the time of wearing.

Further, in the present invention , the non-slip adhesive for fixing to the underwear is attached to the non-skin contact surface of the main body part in which the absorbent body is interposed between the liquid-permeable top sheet and the liquid-impervious back sheet. with the layer is formed, the offset fixing adhesive layer, said strip-shaped displacement of plural rows formed along the longitudinal direction of the absorbent article, respectively, respectively the width direction positions corresponding to the convex curved portion Ru is the fixing adhesive layer. And each strip | belt-shaped slip prevention adhesive layer is made to adjoin to the said convex curve part so that the longitudinal direction distance of an absorbent article of the front-and-back end part and the outline of an absorbent article may be within 15 mm.

  Therefore, the anti-slipping adhesive layer is a strip-like anti-slipping adhesive layer spaced in the width direction so that the absorbent article can follow the movement of the body without being restrained by the movement of the body. You can reduce the sense of discomfort at the time. In addition, the front and rear end portions of each band-dislocation-preventing adhesive layer can be brought close to the convex curve portion, thereby preventing the convex curve portion from being turned or bent at the front side portion and the rear side portion.

As this invention which concerns on Claim 2, each said strip | belt-shaped slip prevention adhesive layer is the imaginary line which connected the vertex parts of the concave curve part adjacent to each said convex curve part, or the vertex part of the adjacent concave curve part, and The front and rear end portions of each band-shaped anti-slipping pressure-sensitive adhesive layer are formed in the above-mentioned curved line-shaped portion so that a virtual line connecting the convex curve part and the intersection part of the napkin side edge intersects the band-shaped anti-slipping pressure-sensitive adhesive layer. the absorbent article of claim 1 wherein the proximity to is provided.

The invention according to claim 2 is an imaginary line connecting the apex portions of the concave curve portions adjacent to each convex curve portion or the apex portion of the adjacent concave curve portion, the convex curve portion, and the napkin side edge. The front and rear end portions of each band displacement preventing adhesive layer are brought close to the convex curve portion so that a virtual line connecting the intersection points intersects the band displacement preventing adhesive layer. That is, it is possible to reliably prevent turning and folding at the convex curve portion by bringing the end portions of the band-shaped anti-slipping adhesive layer into close proximity so as to enter the convex curve portion.

As the present invention according to claim 3, wherein the strip-shaped displacement preventing pressure-sensitive adhesive layer, provides the absorbent article according to any one of claims 1 and 2 is formed in shed intermittently linear to multiple in the middle portion Is done.

The invention described in claim 3 is obtained so as to form the strip-shaped displacement preventing pressure-sensitive adhesive layer intermittently linear, which is divided into multiple in the middle portion. By dividing into intermittent lines, it becomes more difficult to be restrained by the movement of the body, and it is possible to maintain air permeability.

As the present invention according to claim 4 , the band-shaped anti-slipping pressure-sensitive adhesive layer is divided in the front-rear direction at the body fluid discharge site, and the band-shaped anti-slipping pressure-sensitive adhesive layer positioned in front of the body fluid discharge site is a wavy shape of the front portion. Each band-shaped anti-adhesive adhesive layer disposed at each position in the width direction corresponding to each convex curve portion of the line and located on the rear side of the body fluid discharge site is each convex curve of the wavy shape line of the rear portion. An absorptive article given in any 1 paragraph of Claims 1-3 arranged at each of a cross direction position corresponding to a portion is provided.

In the invention according to claim 4, the position in the width direction of the convex curve portion on the side portion is between the wavy shape line formed on the front portion of the absorbent article and the wavy shape line formed on the rear portion. In the case of the present invention which is different, when a band-shaped anti-slipping adhesive layer is arranged in conformity with the convex curve part of one (front part or rear part), the convex curve of the other (rear part or front part) Since the position of the belt-shaped displacement prevention adhesive layer is divided in the front-rear direction at the body fluid discharge site, the belt-shape displacement prevention adhesive layer located on the front side of the body fluid discharge site is the front side. Arranged at each of the positions in the width direction corresponding to the convex curve portion of the wavy shape line of the portion, the band-shaped anti-slipping adhesive layer located on the rear side of the body fluid discharge site is the wavy shape of the rear portion. to arrange the respective width direction position corresponding to the convex curved portion of the wire It is intended. Therefore, each strip-like anti-slipping adhesive layer arranged in each of the front and rear parts is arranged corresponding to each convex curve part, and the convex curve part can be reliably prevented from being turned up or broken.

As the present invention according to claim 5, wherein the strip-shaped displacement preventing pressure-sensitive adhesive layer, the absorbent according to claims 1 to 4, or that is set was the width dimension is proportional to the arc length of the convexly curved portion Articles are provided.

In the invention according to the fifth aspect , the band-shaped anti-slipping adhesive layer sets the width dimension in proportion to the arc length of each convex curve portion. That is, turning and folding can be reliably prevented by setting the width of the band-shaped anti-slipping adhesive layer in proportion to the size of each convex curve portion.

As the present invention according to claim 6, wherein the front and rear ends of the strip-shaped displacement preventing pressure-sensitive adhesive layer, the absorbent according to any of claims 1 to 5, which is curved along the convex curved portion Articles are provided.

The invention according to claim 6 can prevent the curving and folding of the convex curve portion more effectively by forming both end portions of the band-shaped anti-slipping adhesive layer along the convex curve portion. .

As the present invention according to claim 7 , the front end portion and the rear end portion of the band-shaped anti-slipping adhesive layer are rectangular, and the convex shape is located at a position adjacent to the longitudinal direction of the absorbent article from the rectangular end portion. the absorbent article according to any one of claims 1 to 5 are arranged dot-like displacement preventing pressure-sensitive adhesive layer having a curved portion along the curved portion is provided.

The invention according to claim 7 is characterized in that the front end portion and the rear end portion of the band-shaped anti-slipping adhesive layer are kept in a rectangular shape, and the convex portion is positioned at a position adjacent to the longitudinal direction of the absorbent article from the rectangular end portion. By disposing a dot-shaped anti-slipping adhesive layer having a curved portion along the curved line part, the end part of the anti-slipping adhesive layer is formed into a pattern along the convex curved part.

As described above in detail, according to the present invention, it is possible to conform to different body shapes on the front side and the rear side of the body, to easily follow the movement of the body, and to improve the wearing feeling. Become.

Further , by following the movement of the body , it is possible to reduce the uncomfortable feeling in the wearing state, and it is possible to eliminate the turning and folding of the flap portions of the front part and the rear part.

It is a partially broken expanded view of the example of the sanitary napkin which concerns on this invention. FIG. It is the III-III arrow directional view of FIG. It is a short development view showing the position of the leg to sanitary napkin 1. It is an enlarged view of the front side part of the sanitary napkin 1 of FIG. It is a shorts development view explaining the direction of wrinkles accompanying movement of shorts. It is an enlarged view of the front part of the sanitary napkin 1 of FIG. It is a back view which shows the slip prevention adhesive layer 8. FIG. It is a back view which shows the other example (the 1) of the slip prevention adhesive layer 8. FIG. It is a back view which shows the other example (the 2) of the slip prevention adhesive layer 8. FIG. It is a back view which shows the other example (the 3) of the slip prevention adhesive layer 8. FIG. It is a back view which shows the other example (the 4) of the slip prevention adhesive layer 8. FIG. It is a back view which shows the other example (the 5) of the slip prevention adhesive layer 8. FIG. It is a top view which shows the sanitary napkin which concerns on patent document 1. It is a back view which shows the conventional panty liner based on patent document 2. FIG.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

[Structure of sanitary napkin 1]
As shown in FIG. 1, the sanitary napkin 1 includes a liquid-impervious back sheet 2 made of a polyethylene sheet, a polypropylene sheet, and the like, and a liquid-permeable top sheet 3 that quickly permeates menstrual blood, venom, and the like. The absorbent body 4 made of cotton-like pulp or synthetic pulp interposed between the two sheets 2 and 3 and the crepe paper 5 surrounding the absorbent body 4 for maintaining the shape of the absorbent body 4 and improving the diffusibility. And the side nonwoven fabrics 7 and 7 respectively formed along the longitudinal direction on both sides of the surface. Around the absorber 4, at the upper and lower edge portions, the outer edge portions of the liquid-impervious back sheet 2 and the liquid-permeable surface sheet 3 are joined by an adhesive such as hot melt or an adhesive means such as heat seal. In addition, the liquid-impervious back sheet 2 and the side nonwoven fabric 7 that extend laterally from the absorbent body 4 at both side edges thereof are bonded to each other by an adhesive such as hot melt or an adhesive means such as heat seal. In addition, a flap portion F where the absorber 4 does not exist is formed on the outer periphery.

Hereinafter, the structure of the sanitary napkin 1 will be described in detail.
As the liquid-impermeable back sheet 2, a sheet material having at least water shielding properties such as an olefin resin sheet such as polyethylene or polypropylene is used. In addition, a laminated nonwoven fabric obtained by laminating a nonwoven fabric on a polyethylene sheet or the like, or A nonwoven fabric sheet (in this case, the waterproof film and the nonwoven fabric constitute a liquid-impervious back sheet) can be used after substantially impervious to liquid imperviousness by interposing a waterproof film. In recent years, those having moisture permeability tend to be used from the viewpoint of preventing stuffiness. This water- and moisture-permeable sheet material is a microporous sheet obtained by forming a sheet by melting and kneading an inorganic filler in an olefin resin such as polyethylene or polypropylene, and then stretching in a uniaxial or biaxial direction. It is. In particular, in the present invention, it is preferable to use a highly flexible material such as a film as the liquid-impermeable back sheet 2 in order to realize the integrity of the flap portion F and the shorts S, which will be described in detail later.

  Next, as the liquid-permeable surface sheet 3, a porous or non-porous nonwoven fabric or a porous plastic sheet is preferably used. Examples of the material fibers constituting the nonwoven fabric include synthetic fibers such as polyethylene or polypropylene, synthetic fibers such as polyester and polyamide, recycled fibers such as rayon and cupra, and natural fibers such as cotton. A nonwoven fabric obtained by an appropriate processing method such as a lace method, a spun bond method, a thermal bond method, a melt blown method, or a needle punch method can be used. Among these processing methods, the spunlace method is excellent in terms of flexibility and drapeability, and the thermal bond method is excellent in terms of being bulky and soft.

  The absorbent body 4 interposed between the liquid-impervious back sheet 2 and the liquid-permeable top sheet 3 is made of, for example, fluffy pulp and a water-absorbing polymer. The water-absorbing polymer is mixed in the pulp constituting the absorber, for example, as granular powder. Examples of the pulp include chemical fibers obtained from wood, cellulose fibers such as dissolved pulp, and artificial cellulose fibers such as rayon and acetate. Softwood pulp having a longer fiber length than hardwood pulp functions and It is preferably used in terms of price. When the crepe paper 5 surrounding the absorbent body 4 is provided as in this example, the crepe paper 5 is interposed between the liquid-permeable surface sheet 3 and the absorbent body 4 as a result. The crepe paper 5 which is excellent in diffusing body fluids quickly prevents reversal of menstrual blood and the like. In particular, in the present invention, as described in detail later, one of the objects is to reduce the uncomfortable feeling when the napkin is attached, and therefore the thickness of the absorber 4 should be in the range of about 0.5 to 5 mm. Preferably, the manufacturing method of the absorbent body 4 is preferably a piled pulp or an airlaid absorbent body so as to be rich in flexibility. In addition, although not shown in figure, the absorber 4 is good also as a middle-high structure where the blood-evacuation port corresponding | compatible part swelled.

  On the other hand, side non-woven fabrics 7 and 7 are provided on both sides of the sanitary napkin 1 along the longitudinal direction and almost the entire length of the napkin 1, respectively. Wing-like flaps W, W are formed by a part of the liquid-impervious back sheet 2 that extends sideways and also extends sideways.

  As the side nonwoven fabric 7, a water-repellent treated nonwoven fabric or a hydrophilic treated nonwoven fabric can be used from the viewpoint of an important function. For example, if importance is placed on functions such as preventing permeation of menstrual blood or vaginal discharge, or enhancing the touch feeling, water repellent treatment coated with silicon, paraffin or alkylchromic chloride water repellent It is desirable to use a nonwoven fabric. Further, if importance is attached to the absorption of menstrual blood and the like in the wing-shaped flaps W, W, a method of polymerizing a compound having a hydrophilic group, for example, an oxidation product of polyethylene glycol, in the process of producing a synthetic fiber, , By treating with a metal salt such as stannic chloride, partially dissolving the surface to make it porous, and depositing metal hydroxides to swell or make the synthetic fiber porous, applying capillary action to make it hydrophilic It is desirable to use a hydrophilic treated non-woven fabric provided with.

  In the present invention, in particular, the convex curved portions 11 and 13 in which the outer shape of the flap portion F at least in the front portion and the rear portion of the sanitary napkin 1 continuously changes the direction of the tangent to the outer shape line of the flap portion F. In the front part and the rear part of the napkin 1, the shape of the absorber is a linear inclined line 4 a, 4 a in which the width gradually decreases on both sides, and the center The arcuate line 4b connecting the inclined lines 4a and 4a to each other is formed in the portion, and the wavy line 10 is formed along the inclined lines 4a and 4a and the arcuate line 4b.

More specifically, as shown in FIG. 5, in the front part and the rear part of the sanitary napkin 1, the outer shape of the flap part F is relatively at the center part (central tip part) in the width direction of the napkin 1. The wavy shape line 10 formed along the inclined line 4a on both sides of the central convex curve part 11 having a large curvature radius is formed on the flap part F with respect to a straight line parallel to the inclined line 4a of the absorber 4. It is a wave-like curve in which the convex curve portion 13 and the concave curve portion 12 are alternately arranged so that the direction of the tangent to the outline line continuously changes positively and negatively. The convex curved portion 13 and the concave curved portion 12 located on both sides of the central convex curved portion 11 are formed in a symmetrical arrangement with respect to the napkin longitudinal center line .

  In this case, the central convex curve portion 11 disposed at the center tip is a curve having a relatively large radius of curvature with a radius of 20 to 30 mm, and the wavy shape line formed along the inclined lines 4a on both sides. The 10 portion is preferably a combination of the concave curve portion 12 and the convex curve portion 13 having a relatively small radius of curvature with a radius of 10 to 15 mm.

  Particularly in the sanitary napkin 1, as shown in FIG. 2, the central convex curve portion 11 of the front portion has a relatively large radius of curvature and arc relative to the central convex curve portion 11 of the rear portion. It is formed with long. That is, the relationship of curvature radius Rf> curvature radius Rb, arc length Lf> arc length Lb. These radius of curvature ratio and arc length ratio are 1.1 or more and 3.0 or less, preferably 2.0 or more and 2.5 or less. In particular, when the curvature radius ratio and the arc length ratio are 2.0 or more and 2.5 or less, the balance of appearance can be improved in a plan view and the fit can be improved. Accordingly, the front side portion of the sanitary napkin 1 has a relatively large central convex curve portion 11, so that the contact with the pubic bone is softened, and the uncomfortable feeling that breaks toward the pubic side can be reduced. On the other hand, the rear side portion of the napkin 1 has a relatively small central convex curve portion 11, so that it is easy to bite into the valley of the buttocks.

  As described above, in the case of the sanitary napkin 1 in which the wavy shape lines of the front and rear portions are changed in accordance with the body shape of the body, it is easy to follow the movement of the body along the body shape. In addition, it is possible to reduce a sense of discomfort at the time of wearing.

  As shown in FIG. 4, for example, when seated, both legs are in the positions LF and LF with respect to the shorts S. In this case, a pressing force is applied to both sides of the front portion of the flap portion F from the inner portion of the leg. However, in the sanitary napkin 1, since the wavy shape line 10 is formed on the front side portion and the rear side portion, the pressing force acting on the flap portion outlines on both side portions is the concave curve portion 12 of the wavy shape line. And the central convex curve portion 11 and the convex curve portion 13 gradually act (the force application point becomes intermittent), and the force is deflected by the curve, so that the flap portion F is wrinkled. Does not occur. In addition, even if wrinkles occur, they are confined at the convex curve portion and are not propagated to the inner portion, so that the wrinkles can be prevented from progressing to the inside of the flap portion.

  In addition, since the legs are in the LF and LF positions when sitting, the shorts S itself is stretched and contracted along the circumference of the legs, and due to the expansion and contraction of the shorts S, the napkin 1 also has a compressive force or tensile force due to friction. Although it is acted, it is gradually acted by the concave curve portion 12, the central convex curve portion 11 and the convex curve portion 13 of the wavy shape line 10, and the force is deflected by the curve, so that the flap It is difficult for wrinkles to occur in part F.

  Furthermore, as shown in FIG. 5, in the sanitary napkin 1, in the front part and the rear part, the flap part F is a flap from the edge of the absorbent body 4 to the outline at the central tip part of the sanitary napkin 1. The width D1 is formed relatively large, and the flap width D2 from the edge of the absorber 4 to the outline is formed relatively small in the formation portion of the wavy shape line 10 formed along the inclined line 4a on both sides. ing. This is because the central tip of the sanitary napkin 1 that does not reach the leg even when sitting or walking can cope with the pre-leakage of body fluid, and the flap is formed at the part where the wavy shape line 10 that hits the base of the leg is formed. The portion F has a structure in which wrinkles and twists are unlikely to occur.

  On the other hand, when the leg is moved back and forth during walking or the like, the shorts S expands and contracts with the movement of the leg, and at this time, the shorts S are wrinkled in a direction orthogonal to the direction of the leg movement. Specifically, as shown in FIGS. 6 and 7, the direction in which the shorts S expand and contract with the movement of the legs during walking is about 19 ° to 40 ° with respect to the longitudinal center line of the napkin 1, It is clear from observation results of the inventors that the angle is about 36 ° on average. At this time, wrinkles are likely to occur along the direction orthogonal to the movement of the shorts S. However, in the sanitary napkin 1, the wavy shape line 10 is formed on the front part and the rear part. Generation of wrinkles can be prevented by gradually applying or diverting the force for generating wrinkles in the direction of movement of S. In addition, since the central convex curve portion 11, the convex curve portion 13, and the concave curve portion 12 are continuously changed in the direction of the tangent to the outline, various angles acting within a certain width are used. Can respond to force.

  Note that the wavy shape line 10 must be applied so as to gradually apply or deviate the force that generates wrinkles, and thus a knurled curve in which the tangent to the outline is discontinuous is excluded. .

[Other examples]
(1) In the above embodiment, the sanitary napkin 1 is provided with the wing-shaped flaps W, W formed on the sides. However, the sanitary napkin 1 that does not have the wing-shaped flaps W, W can be similarly applied.

[Anti-slip adhesive layer 8]
As shown in FIG. 8, the non-skin contact surface of the main body part in which the absorbent body 4 is interposed between the liquid-permeable top sheet 3 and the liquid-impervious back sheet 2 is for fixing to the underwear. In addition, a plurality of strip-stopping adhesive layers 8 in the illustrated example are formed by an appropriate coating pattern, and these slip-stopping adhesive layers 8 are covered with a release material for main body (not shown). Further, a wings prevention adhesive layer 9 is formed on the surface of the wing-shaped flaps W, W on the liquid-impermeable back sheet 2 side, and the wings prevention adhesive layers 9, 9 are not shown. Covered with a release material. Preferably, the release material is formed by joining the release material for the main body and the release material for wings arranged in the transverse direction at an intersection so that the release material can be removed with a single peeling operation. W and W may be so-called belly folds that fold to the liquid-permeable topsheet 3 side in the individual packaging state, or may be so-called back folds that fold to the liquid-impermeable backsheet 2 side. Moreover, you may make it isolate | separate into right and left instead of one peeling material as a peeling material which covers the wings prevention adhesive layer 9 and 9. FIG.

  As the release material, for example, a release treatment liquid such as a silicone resin, a fluorine resin, or a tetrafluoroethylene resin is applied to the contact surfaces with respect to the anti-displacement adhesive layers 8 and 9, or spray coating is performed. A release-treated paper or plastic sheet can be used.

  As the pressure-sensitive adhesive that forms the anti-displacement pressure-sensitive adhesive layers 8 and 9, for example, a styrenic polymer, a tackifier, or a plasticizer whose main component is preferably used. Examples of the styrene polymer include a styrene-ethylene-butylene-styrene block copolymer, a styrene-butylene-styrene block copolymer, a styrene-isobutylene-styrene block copolymer, and a styrene-butadiene-styrene block copolymer. Although only one of these may be used, two or more polymer blends may be used. Among these, a styrene-butadiene-styrene block copolymer is preferable in terms of good thermal stability. As the tackifier and plasticizer, those that are solid at room temperature can be preferably used. Examples of the tackifier include C5 petroleum resins, C9 petroleum resins, dicyclopentadiene petroleum resins, and rosin petroleum resins. Polyterpene resin, terpene phenol resin, etc., and examples of the plasticizer include monomer plasticizers such as trifresil phosphate, dibutyl phthalate, dioctyl phthalate, and polymer plasticizers such as vinyl polymers and polyesters. It is done.

  The anti-slipping adhesive layer 8 is a plurality of strip-like anti-slipping adhesive layers formed along the longitudinal direction of the sanitary napkin 1 at positions corresponding to the central convex curve part 11, the convex curve part 13. 8A to 8C, and the front and rear end portions of the band-shaped anti-slipping adhesive layers 8A to 8C are close to the central convex curve portion 11 and the convex curve portion 13, respectively. In the illustrated example, the strip-shaped offset adhesive layer 8A is formed at a position corresponding to the central convex curved portion 11, and the strip-shaped offset adhesive layers 8B, 8C are formed at positions corresponding to the left and right convex curved portions 13, 13. Thus, a total of five strip-like adhesive layers are formed.

The central convex curve portion 11 is set so that the longitudinal distance S between the front and rear end portions of each strip-like adhesive layer 8A to 8C and the outline of the sanitary napkin 1 is preferably within 15 mm, more preferably within 10 mm. , It is desirable to be close to the convex curve portion 13.

As shown in FIG. 9, the proximity of the band-shaped anti-slipping adhesive layers 8 </ b> A to 8 </ b> C to the outline of the sanitary napkin 1 is such that the central convex curve portion 11 and the convex curve portion 13 located inside are as follows. The imaginary lines (L1, L2) connecting the apexes of the adjacent concave curve portions 12 and the convex curve portions 13 located outside are the apex portions of the adjacent concave curve portions 12, the convex curve portions 13, and the napkin side. The front and rear end portions of the band-shaped anti-slipping adhesive layers 8A to 8C are formed in the central convex shape so that the imaginary line (L3) connecting the intersections with the edges intersects the band-shaped anti-slipping adhesive layers 8A to 8C. It is further desirable that the curved portion 11 and the convex curved portion 13 are close to each other. In other words, the end portions of the band-shaped slip prevention adhesive layers 8 </ b> A to 8 </ b> C are brought close to each other in the regions of the central convex curve portion 11 and the convex curve portion 13. If they are close to each other in this way, the center convex curve portion 11 and the convex curve portion 13 can be remarkably prevented from being turned or bent.

As shown in FIG. 10, the strip-shaped adhesive layers 8 </ b> A to 8 </ b> C are not restrained by the movement of the body in the front-rear direction and do not impair air permeability. the pressure-sensitive adhesive layer 8A-8C, may be formed intermittently linear, which is divided into multiple in the middle portion.

By the way, in the case of the sanitary napkin 1, the central convex curve portion 11 of the front portion is formed with a relatively large radius of curvature and arc length with respect to the central convex curve portion 11 of the rear portion. Therefore, the positions of the convex curve portions 13 and 13 are different in the width direction between the wavy shape line 10 formed in the front portion and the wavy shape line 10 formed in the rear portion. In this case, when the band-shaped anti-slipping adhesive layers 8A to 8C are arranged in accordance with the convex curve portion 13 on one side (the front side portion or the rear side portion), the convex curve portion 13 on the other side (the rear side portion or the front side portion) 11, the strip-like anti-adhesive adhesive layers 8A to 8C are divided in the front-rear direction at the body fluid discharge site H, and are positioned in front of the body fluid discharge site H as shown in FIG. The strip-like anti-slipping adhesive layers 8A to 8C are arranged at respective positions in the width direction corresponding to the convex curve portion 13 of the wavy shape line 10 of the front side portion, and are located on the rear side of the body fluid discharge site H. It is desirable that the anti-displacement pressure-sensitive adhesive layers 8A to 8C are arranged at respective positions in the width direction corresponding to the convex curve portion 13 of the wavy shape line 10 in the rear portion. By setting it as such a shift prevention adhesive layer pattern, each strip | belt-form shift prevention adhesive layer 8B and 8C arrange | positioned at each front and rear part comes to be arrange | positioned corresponding to each convex curve part 13, It is possible to reliably prevent the convex curve portion 13 from being turned or bent.

  Furthermore, when the front end part and the rear end part of the band-shaped anti-slipping pressure-sensitive adhesive layers 8A to 8C have a curved shape along the central convex curve part 11 and the convex curved part 13, the central convex curve part 11 is formed. , The effect of preventing the curving and bending of the convex curve portion 13 is enhanced. The example shown in FIG. 12 is an example in which the shape of the front end portion and the rear end portion of each band-shaped anti-slipping adhesive layer 8 </ b> A to 8 </ b> C is formed along the central convex curve portion 11 and the convex curve portion 13. . In the example shown in FIG. 13, the front end portion and the rear end portion of the strip-shaped anti-adhesive adhesive layers 8 </ b> A to 8 </ b> C remain rectangular, and the rectangular end portions are adjacent to the longitudinal direction of the sanitary napkin 1. This is an example in which dot-shaped anti-displacement adhesive layers 8 a to 8 c having curved portions along the central convex curve portion 11 and the convex curve portion 13 are arranged.

  Furthermore, as shown in FIG. 13, the band-shaped anti-slipping adhesive layers 8 </ b> A to 8 </ b> C are the sizes of the corresponding central convex curve portion 11 and convex curve portion 13 (determined by the arc length and / or the radius of curvature). The width dimension may be varied in accordance with the above. That is, since the central convex curve portion 11 is larger than the side convex curve portion 13, the strip-shaped adhesive layer 8 A having a relatively large width is formed, and the convex curve portions 13 and 13 on both sides thereof are formed. Therefore, the strip-like adhesive layers 8B and 8C may be formed with a relatively small width.

  DESCRIPTION OF SYMBOLS 1 ... Sanitary napkin, 2 ... Liquid-impermeable back sheet, 3 ... Liquid-permeable surface sheet, 4 ... Absorber, 5 ... Crepe paper, 7 ... Side nonwoven fabric, 8A-8C ... Strip | belt-shaped slip prevention adhesive layer, 8a ˜8c: Dot-like non-displacement adhesive layer, 10: Wavy line, 11: Central convex curve part, 12: Concave curve part, 13 ... Convex curve part

Claims (7)

An absorber is interposed between the liquid-permeable top sheet and the liquid-impervious back sheet, and a flap portion that does not have an absorber is formed around it, at least in the front part and the rear part of the absorbent article In the absorbent article in which the outer shape of the flap portion is a wavy shape line composed of a combination of a convex curve portion having a predetermined curvature radius and a concave curve portion having a predetermined curvature radius ,
The wavy shape line has a central convex curve portion at the center in the width direction of the absorbent article, and a convex curve so that the direction of the tangent to the outline of the flap portion continuously changes positively and negatively on both sides thereof. And the concave curve portion are alternately arranged in a wavy curve, and the convex curve portion and the concave curve portion located on both sides of the central convex curve portion are the longitudinal center line of the absorbent article. Formed symmetrically on the border,
The central convex curve portion of the front portion is formed with a relatively large radius of curvature and arc length with respect to the central convex curve portion of the rear portion ,
A non-slip adhesive layer is formed on the non-skin contact surface of the main body portion where the absorbent body is interposed between the liquid-permeable surface sheet and the liquid-impermeable back sheet, for fixing to underwear, The anti-slipping adhesive layer is a plurality of strip-like anti-slipping adhesive layers formed along the longitudinal direction of the absorbent article at each of the positions in the width direction corresponding to the respective convex curved parts, and each The strip-like anti-slipping adhesive layer is close to the convex curve portion so that the longitudinal distance of the absorbent article between the front and rear end portions and the outline of the absorbent article is within 15 mm . Goods. Each band-shaped anti-slipping adhesive layer is a virtual line connecting the apex portions of the concave curve portions adjacent to the respective convex curve portions, or the apex portion of the adjacent concave curve portion, the convex curve portion, and the napkin side edge. the intersection portion and the imaginary line that connects the can, the strip displacement preventing pressure-sensitive adhesive layer according to claim 1, characterized in that in proximity to the front and rear ends of the respective strip-like displacement preventing pressure-sensitive adhesive layer on the convex curved portion so as to cross Absorbent article. The strip displacement preventing pressure-sensitive adhesive layer, an absorbent article according to any one of claims 1 and 2 are formed intermittently linear, which is divided into multiple in the middle portion. The band-shaped anti-slipping pressure-sensitive adhesive layer is divided in the front-rear direction at the body fluid discharge site, and the band-shaped anti-slipping pressure-sensitive adhesive layer located on the front side of the body fluid discharge site corresponds to each convex curve portion of the wavy shape line of the front side portion. The band-shaped anti-slipping adhesive layer that is disposed at each of the width direction positions to be located on the rear side of the body fluid discharge site corresponds to each of the width direction positions corresponding to the respective convex curved portions of the wavy shape line of the rear side portion. The absorbent article in any one of Claims 1-3 arrange | positioned. The absorbent article according to any one of claims 1 to 4, wherein the band-shaped anti-slipping adhesive layer has a width dimension set in proportion to an arc length of each convex curved portion. The absorbent article according to any one of claims 1 to 5 , wherein a front end portion and a rear end portion of the band-shaped slip prevention adhesive layer have a curved shape along the convex curve portion. The front end portion and the rear end portion of the band-shaped anti-slipping adhesive layer are rectangular, and a curved portion along the convex curved portion is provided at a position adjacent to the rectangular end portion in the longitudinal direction of the absorbent article. the absorbent article according to any one of claims 1 to 5 are arranged dot-like displacement preventing pressure-sensitive adhesive layer having.

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